Mechanism for adjusting the lengths of stitches in sewing-machines.



No. 811,582. PATENTED FEB. 6, 1906.

O. P EDERSEN. MECHANISM FOR ADJUSTING THE LENGTHS 0F STITGHES IN SEWING MACHINES.

APPLIUATION FILED AUG. 14, 1905- 2 SHEETS-SHEET 1.

IEI

02' l c0 flmvenkw a ."m wg Ghmbaan pedmm M N BYflnL/M m No. 811,582 PATENTED FEB. 6, 1906.

V G. PEDERSEN. MECHANISM FOR ADJUSTING THE LENGTHS OF STITGHES IN SEWING MACHINES.

APYLIOATION FILED AUG.14, 1905.

2 SHEETS-SHEBT 2.

inve'nhor: Ghrisbian Pedevsen;

avid/Ma (EL/Wm ATT'YS- learner i v tlllhhl, (El Ell. LQUIS, MlSSOURl, ASSIGNOR TO LANDTQ" llll llli CUMFANY, Oh ST. LOUIS, MISSOURI, A CORPORATION OF l lll-Lilh lllilll Hill r ill lllSTlNi-i THE LENGTHS f STITCHES IN SEWINGJWACHINES.

{specification of Letters Patent.

Patented Feb. 6, 190%.

Application filed August 14, 1905. Serial Ila. 274,115.

filo ft whom it rusty concern:

Po it known that l, @mnsrmu PnnERsEN, the llnited States, residing at St. Louis, ll fisscuri, have invented e certain new eful improvement in Mechanisms for "ting the Length ofa @titch in Sewin J of which the following is a fu l, tot d scription, such as will en- .."llcd in the art to which it appertains to niche and use the same, reference being had to the eccoinpanying drawings, f g part of this specification, in whiche 1 a side elevational view of a portion U1 a sewing-inuchine.n1echanism, showin ni invention applied. Fig. 2 is a top iew of the canoe. Fig. 3 is e cross-secview on the line 3 3 of Fig. 1 loolringin 1e direction indicated by the arrow. Fig. 4 isa cross-sectional view through the fulcrum of the vibrating shifting-lever. Fig. 5 is a top plan view of the fulcrum, the je1n-nut being removed. Fig. 6 is a cross-sectional view through the uwl-adjusting device. Fig. 7 is e. cross-sectionel view through the shiftinglever, showing the stop-pin in elevation; and F g. is a cross-sectional view through the awl-iever the needleguide resser-foot, and needle-carrier.

This invention relates to mechanism used in connection with sewingsnachines for adjusting the pants to control the length of stitch in the work.

me of the objects of the invention is to provide a simple and 'eflicient mechanism ca- )able of governing the length of stitch made y the machine; and the invention consists in certain novel details of construction and combination of parts, all of which will be specilically described hereinafter, reference being had to the accompanying drawings, in which i The reference-numeral 1 designates aframe carrying a drive-shaft 2, on. one end of which is a drive-pulley 3, receivin power from any suitable source. 011 the s aft 2 is a disk 4, having a cam 5 on one side and a cam 6 in its periphery.

olournaled in the forward portionof the machi no on the frame 1 is a rock-shaft 7, hav ing a crank-mun it connected to a lever 9 by a lint; 10, wh. ll term the needle bar. The

WM: 9 is lined on a roelnshait" 11 at the rear portion of the frame, and interinediete the ends of the lever 9 is a roller 12, working in. the com 5, so that the rotation of the cam will give the pro or throw to the lever to roclr the shaft 7. T 1e shaft 7 is longitudinally movable of the bearings in which it is journaled and has connected thereto, as shown in Fig. 8, a shifting device 13, having a grmvvc 14 in which one end of a shifter 15 eng: The end of the shifter 15 is provided wit an enlarged head 16, having a socket therem in which i. secured one end of a vibrating shifting-lever 17 The vibrating shifting-lever 17 is connected to the head 16 by a pivot 18, and in rear of the pivot is a slot 19 in the head 16, through which a fastening device 20 projects to engage the reduced end of the lever 17, 'hich is in the socket of head 16; Through one side of the head projects and adjustingscrew 21, which may engage with the constricted end of the lever 17, as will be presently explained. The shifting lever 17 is provided with an elongated slot 22, through which projects an adjustable fulcrum 23,co11 nected to a spindle 24 in an elongated slot on the frame 1. The fulcrum 23, which is a sleeve on the spindle, is of greater depth than the thickness of the lever, so that when said spindle, which is provided with a head 25, is held in its adjusted position by the j uni-nut 26 the lever 17 will be free to movc-that is to se the lever 17 will be permitted to rock in a orizontal plane, but will be prohibited fromhaving a, reciprocatory motion on account of the pin 2.7,which projects from the rigid part on the machine into the transversely elongated slot 28 in the lower face of the lever 17. The rear end of lever 17 is pro- Vided with a roller 29, which fits in the'cam 6 in the periphery of the disk 4, so that the rotation of the disk will impart the necessary sidewise movement to said lever 17 30 is the work-table, having a guide-slot 31 therein, and 32 designates the Presserfoot. i

33 is the needle, and 34 the needle-guide.

The power end of the lever 17 being at 29, it is obvious that the eater the distance be tween the fulcrum of said lever 17 and the ation of the disk and the nearer the fulcrum 3 2% W111 spihdls 24 site? the arts l .the greater the movement of the awi, which needle, and the faste'm'n is to the roller 12 the greater Will he the movement of the shifter 15, and consequently and is. carried by the shifting device it}. Therefore by changing the fulcrum the shifting of the Work during each complete revoiution of the disk will be overned to suit existing circumstances; 0

that the aWl will aline With the needle when the openin. is made in the leather or materiel I to be seWe In making the re uired ust-' I ment the adjusting device 21 will be oper ated tftei" loosening the fastening device :26 so as to shift the shiit'er t at the etvl be caused to alin'e inth 'devi'o'e 20 will then be etus-ed to bind the shifter 15 rigid with the course it is desirable. I

letter 17. fiteiithe awl and the ne'edie sire tttstd to ttptn aiinethe hitte -t wit I moved to the roper position required to make the testis length of stitch, tilt: the its 1 be trttreddtwn tight, so that the ll be hei'd i'ig'i'cl with thefi'ttm'e "i. are thus atten ed the tot-titles of the dis ejwiil cause the toilet 29 on the le 17 to vi'hi'ate in the Chin-groove 6, and. i thfqs iinpa'rt esi'cl'ewi'se movement to the awl, I and ts the a lwi'll be in the/Work during the I sidetiise moi einen't the work will be shifted a suflieient distance to ooinei'de with the length of stitch which it is desired to make. Duiin'g the time that the sidewi'se movement is "tithing place the needle Will he out of engege eht with the Work and the pr'esser -ioot 32 fvjviii have iei'eeseii the work, so that itwiii he le'vei 9 and the shifting;

' fete? 17 si'e so timedwith i'esb'eot "to theii' respectivt cams that the shaft 7 will not he recites-tintin the shiftin movement, bet the ebi fl will first be caused to engage the Woih, then shift it, then "Withdraw, then ,p'eithe needle to enter the work and with I that, anti then the aivl will again enter the Work, and a sn'eees'si'on of these opeietions 1 15 on its pivot 18, so

toe dtiiigig the sewing of the mate- Havin thus dese 'ihecl n5 invention What 1. in e sewing-machine, e sliclahle swl- C2131, ing element, & ie'vei i 51 sliding the swieeiiyingeienient, a net on the lever engaging the awhearrying element, and means for eileeting an adjustable eonneetion between the said part and the level to eiine the eWl e neetiie of the sewingqnaohine; suhly 2S described.

o'enying element, a level "for sliding the ewiettzi'fing element, a part on the l'eVei' engag ing the esvi-ceri ving element, means for effecting en t; hie connection between said part and the lever, and e variable fuleiuin for said level; suhstentieilyes described.

3, in sewingineehine, a slidehle att ieetryii'ig element, enoelh'ng lever for sliding seid ewi earr ingfeienient end having an eiongateci slot, e vei'i'ehle fui'einin for said lever in said slot, and. means independent of the 11km in for pieve g iongitu dine]. movement of said lever snhstentieily as described.

4. in it sewingqneohine, e shaft, 3. shiftying element on said shaft, :1 ing said awi esrr ving element and having it socket, lever having one end in said socket, and adjusting device for varying the angle 01" inoii'nation oi the shifter it"ith to eline the ewl with the n" seWi Hl&Cl1lIl=3,' substanee of two Witnesses,

a, sewing meeinne, slidebl'e ztwi- Q. hereunto affix m 

